content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import static org.junit.Assert.assertEquals;
  
  import java.util.List;
  import java.util.concurrent.Callable;
  
  import org.junit.Test;
  
  import io.reactivex.common.*;
  import io.reactivex.common.exceptions.TestException;
  import io.reactivex.observable.Observable;
  import io.reactivex.observable.observers.TestObserver;
  
  public class ObservableFromCompletableTest {
  
      @Test
      public void disposedOnArrival() {
          final int[] count = { 0 };
          Observable.fromCallable(new Callable<Object>() {
              @Override
              public Object call() throws Exception {
                  count[0]++;
                  return 1;
              }
          })
          .test(true)
          .assertEmpty();
  
          assertEquals(0, count[0]);
      }
  
      @Test
      public void disposedOnCall() {
          final TestObserver<Integer> to = new TestObserver<Integer>();
  
          Observable.fromCallable(new Callable<Integer>() {
              @Override
              public Integer call() throws Exception {
                  to.cancel();
                  return 1;
              }
          })
          .subscribe(to);
  
          to.assertEmpty();
      }
  
      @Test
      public void disposedOnCallThrows() {
          List<Throwable> errors = TestCommonHelper.trackPluginErrors();
          try {
              final TestObserver<Integer> to = new TestObserver<Integer>();
  
              Observable.fromCallable(new Callable<Integer>() {
                  @Override
                  public Integer call() throws Exception {
                      to.cancel();
                      throw new TestException();
                  }
              })
              .subscribe(to);
  
              to.assertEmpty();
  
              TestCommonHelper.assertUndeliverable(errors, 0, TestException.class);
          } finally {
              RxJavaCommonPlugins.reset();
          }
      }
  
      @Test
      public void take() {
          Observable.fromCallable(new Callable<Object>() {
              @Override
              public Object call() throws Exception {
                  return 1;
              }
          })
          .take(1)
          .test()
          .assertResult(1);
      }
  }
  